RM35X0E _59 Vehicle Exterior _079320 WIPER / WASHER _0385301 WIPER AND WASHER SYSTEM C

WIPER / WASHER  WIPER AND WASHER SYSTEM  B1279  Lost Communication with Humidity/Rain Sensor LIN  


DESCRIPTION

The main body ECU (multiplex network body ECU) and rain sensor communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from
B1279 Lost Communication with Humidity/Rain Sensor LIN
DTC Detection Condition:

Ignition switch ON (IG+ voltage 9.5 V or higher)


Malfunction Status:

Communication malfunction with rain sensor


Malfunction Duration:

Continues for 10 seconds or more


·

Rain sensor

·

Harness or connector


○ Main Body

WIRING DIAGRAM

E404588E07
0.635,3.396 2.354,3.646 1.719,0.25 10 false : LIN Communication Line 1.271,0.5 2.26,0.74 0.99,0.24 10 false ECU-IG1 NO.4 2.406,0.313 4,0.552 1.594,0.24 10 false from IG1 NO.2 Relay 2.865,2.594 3.323,2.792 0.458,0.198 10 false a8 2.854,2.781 3.719,3.052 0.865,0.271 10 false Rain Sensor 2.708,1.958 2.865,2.156 0.156,0.198 10 false 2 2.688,1.156 2.844,1.354 0.156,0.198 10 false 4 2.927,2.073 3.24,2.271 0.313,0.198 10 false ES 2.927,1.271 3.385,1.469 0.458,0.198 10 false SIG 3.406,1.677 3.865,1.875 0.458,0.198 10 false MPX 3.833,1.479 3.99,1.677 0.156,0.198 10 false 3 4.927,1.479 5.083,1.677 0.156,0.198 10 false 3 5.167,1.667 5.781,1.865 0.615,0.198 10 false LIN3 4.76,2.604 5.219,2.802 0.458,0.198 10 false N18 4.74,2.802 6.375,3.229 1.635,0.427 10 false Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

NOTICE:

Inspect fuse for circuits related to this system before performing the following procedure.


PROCEDURE

1.CHECK FOR DTC
a.

Clear the DTC.

Click hereVehicle Exterior>WIPER / WASHER>WIPER AND WASHER SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs
50002 123

b.

Turn the ignition switch to ON and wait for at least 10 seconds.


c.

Check for DTCs.

Click hereVehicle Exterior>WIPER / WASHER>WIPER AND WASHER SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Trouble Codes
50001 123

Result:
Result Proceed to
DTC B1279 is not output. A
DTC B1279 is output. B
DTC B1279 and DTC B1373 are output. C



A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - RAIN SENSOR)

C

GO TO DTC B1373

Click hereVehicle Exterior>WIPER / WASHER>WIPER AND WASHER SYSTEM>B1373


2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - RAIN SENSOR)
a.

Disconnect the N18 main body ECU (multiplex network body ECU) connector.


b.

Disconnect the a8 rain sensor connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N18-3 (LIN3) - a8-3 (MPX) Always Below 1 Ω
N18-3 (LIN3) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BATTERY AND BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BATTERY AND BODY GROUND)
a.
E267170C86
1.458,0.281 1.885,0.521 0.427,0.24 0.896,1.802 1.104,1.802 1.104,1.802 1.563,1.375 true 2.615,1.802 2.354,1.802 2.354,1.802 1.958,1.365 true 0.073,0.063 0.385,0.219 0.313,0.156 10 false *a 1.583,0.302 2.042,0.5 0.458,0.198 10 false a8 0.635,1.719 0.948,1.917 0.313,0.198 10 false ES 2.708,1.719 3.167,1.917 0.458,0.198 10 false SIG
*a Front view of wire harness connector
(to Rain Sensor)


Disconnect the rain sensor connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
a8-2 (ES) - Body ground Always Below 1 Ω



c.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
a8-4 (SIG) - Body ground Ignition switch off Below 1 V
Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE RAIN SENSOR

Click hereVehicle Exterior>WIPER / WASHER>RAIN SENSOR>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR